From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 29 Jan 2013 03:27:33 +0000
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From: Charles Forsyth <charles.forsyth@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] fp crash
Topicbox-Message-UUID: 10e833ac-ead8-11e9-9d60-3106f5b1d025

I looked it up and the change made in Inferno's dtoa.c is shown below:

148,154c1380,1381
< d2.d = d.d;
< word0(d2) &= Frac_mask1;
< word0(d2) |= Exp_11;
---
> word0(d2) = (word0(d) & Frac_mask1) | Exp_11;
> word1(d2) = word1(d);

in other words, it extracts and sets each word, rather than assign as
one type and then access the same cell as a different type.